I believe Joseph Stalin is credited w/ stating that "quantity has a quality all it's own" during WW II battles w/ the much superior trained and armed Nazi Germany infantry and armored units.

In the same sense I feel that having at least 2 tail lights is extremely important.

I personally run 3 radbot 1000 tail lights day and night. 1 on rear rack, flashing . 1 on rack trunk bag / seatpost , steady . And 1 on back of my helmet, steady daytime / flashing night.

I will add that the rack and the seat post mounts are carefully aligned just a couple of degrees slightly to left of bike center line and parallel to road surface.

I'm hoping that Santa will be dropping a magicshine tail light and a cygolight hotshot under the tree come Christmas.

I've had drivers compliment me on how attention GRABBING my display is on hazy /slight overcast days. When going in & out of intermittant (sp?) heavy shade of tree lined streets or urban underpasses.